Answer:
I tell people to be careful when handling boxes.
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
It's in your hand though you can not feel it. Only you and time can reveal it.
I am a type of animal that hang out in the mist
I have thirteen hearts but no body or soul. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?